Sorry for the consecutive and rather simple pre-flop questions.  I want to clear off the rust from my reasoning.

2$ turbo rebuy, winner takes $103, 9 places paid, 14 players are left here.  I have been rather quiet for a few rounds, open folding my last button despite being low stacked.  I had to show down A4o two orbits ago (stealing in position, though got a surrender call from 42o with his 5k stack) – nothing too terrible in my image.  A bit tight but I had been card dead recently and the A4o hand may have shown that I was doing what I could with what I had.

Merge Network $250 Gtd – [+R, Turbo] No Limit Hold'em Tournament – t1250.00/t2500.00 Blinds + t250.00 – 7 players – View hand 2509324
TournamentPokerEdge.com Hand History Converter

nuclearMD (UTG+1): BB = 5.6, t13891
nsrider0427 (MP): BB = 25.0, t62515
meanttodiebroke0 (CO): BB = 19.6, t48884
Hero (BTN): BB = 8.1, t20213
dafelter1 (SB): BB = 6.3, t15740
Mclovin2013 (BB): BB = 13.1, t32846
fmltravel90 (UTG): BB = 0.6, t1486

Pre Flop: (t5500) Hero is BTN with 2 K
4 folds, Hero raises to t19963 all in

What makes me ask if this is such a huge mistake is that three people laughed immediately and one typed “donk.”  If this is too much of a gargabe hand, I'm glad this happened because if it's a leak it will be easy to fix.  Is K2 too much of a garbage hand to pick up chips here, as I do need them and still have fold equity on my steal?

I was surprised that it would be such an obvious mistake – thought it was at least marginal.  Better to shove other hands like 67s?  Is A2o good enough?